Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb42c48a566f670…

MALICIOUS

PDF

38.9 KB Created: 2020-03-20 11:32:35 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2026-05-08
MD5: 59bf18f8dbe9b9459086f626a2ca4959 SHA-1: 206c26d02e54641e741468527c51dce94e946f28 SHA-256: 4cb42c48a566f67090be5678f9c613298f3efb214ea110c4caa260976deab492
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which are dynamically generated and point to domains that appear to be part of a link farm. The document body, though partially corrupted, contains text related to 'Poemas de amistad cortos', suggesting a lure to disguise the malicious intent. The primary goal appears to be directing users to a network of external websites, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://lowcountryessentials.com/uploads/1/3/0/3/130379126/130379126.html#poemas+de+amistad+cortos+de+2+estrofas+y+4+versos PDF link annotation
    • http://lendellblack.net/uploads/1/3/0/7/130776756/safemesofe-potubozukevo-mibofobawoleraw.pdfIn PDF document text
    • http://diaryofavegan.com/uploads/1/3/0/6/130639305/tupabasusameginigu.pdfIn PDF document text
    • http://moneymentorph.com/uploads/1/3/0/6/130605381/1712538.pdfIn PDF document text
    • http://www.discountmarliestix.com/uploads/1/3/0/2/130272387/ba05648a.pdfIn PDF document text
    • http://mta-sts.mail.theqicenter.org/uploads/1/3/0/7/130740151/nekobedobop.pdfIn PDF document text
    • http://hostmaster.barryley.com/uploads/1/3/0/2/130289732/8931967.pdfIn PDF document text
    • http://petalstopins.com/uploads/1/3/0/6/130605216/sebatubozulu_kadavun_sitiw_xemag.pdfIn PDF document text
    • http://eb-purchasing.com/uploads/1/3/0/5/130544494/1771eafd1db.pdfIn PDF document text
    • http://paperbirchyoga.com/uploads/1/3/0/6/130639552/12addc.pdfIn PDF document text
    • http://studioaonline.com/uploads/1/3/0/5/130543261/padofuvo_kivazodori_tijalejakiwe.pdfIn PDF document text
    • http://foodbrandingagency.com/uploads/1/3/0/6/130639177/ramemeponote.pdfIn PDF document text
    • http://hotelslo.us/uploads/1/3/0/6/130604871/xajitapotoporeguxuli.pdfIn PDF document text
    • http://porn4dayz.com/uploads/1/3/0/6/130621390/zedobimupu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE0 8292 bytes
SHA-256: ec16a7fe9dcb783d87cd7e7722d2ae13b3df7e68c2f7db1f26344ef8c7decc4f